<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="/postdata" method="post" enctype="application/x-www-form-urlencoded">
        姓名：<input type="text" name="username"><br>
        年龄: <input type="text" name="age"><br>
        <input type="submit"  value="发送post请求">
    </form>
</body>
</html>